PDF AD8488 Data sheet ( Hoja de datos )

Número de pieza	AD8488
Descripción	128-Channel Digital X-Ray Analog Front End
Fabricantes	Analog Devices
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No Preview Available ! Data Sheet FEATURES 128 integrator channels Correlated double sample error correction (CDS) Corrects for VOS and LF noise Power consumption per channel Normal: 11 mW Low power: 4 mW Low input leakage current: −1.5 pA typical Low input referred noise (QNI): 993 e−rms typical Linearity error: 0.03% typical Compact 17 mm × 17 mm BGA Selectable filter time constants 4 selectable input charge ranges 10 selectable gain ranges APPLICATION High performance digital X-ray systems Medical X-ray Security (baggage scanner) systems 128-Channel Digital X-Ray Analog Front End AD8488 GENERAL DESCRIPTION The AD8488 is a 128-channel, analog front end (AFE) designed for use in high performance digital X-ray systems. The analog channels consist of an integrator followed by a gain selectable single-ended to low impedance differential output. The analog channel converts the charge acquired by X-ray or photodiode detectors to a voltage. The channels are composed of CMOS transistors, using typical high input impedance CMOS gates. The integrators generate charge dependent voltages using a range of selectable capacitance values that accommodate a broad range of input charge values. The integrators are followed by single-ended input to differential output voltage amplifiers where offset and low frequency noise voltages are subtracted from the input voltages. A 128:1 channel differential MUX follows the buffers and drives the analog output buffer. Switch drivers and certain digital timing functions are included, and all are mounted on a 255-lead BGA substrate. Charge conversion for all 128 channels is simultaneous followed by a sequential voltage output read of the channels using a 7-bit address code. The sequence occurs twice, sampling all 128 channels. Logic control inputs, CS_A and CS_B, select the lower and upper 64 blocks of the channel addresses. The AD8488 is packaged in a 17 mm × 17 mm, 255-lead, RoHS- compliant ball grid array (BGA). The operating temperature range is 0°C to 85°C ambient. IN0:127 ANALOG INPUTS VREF FUNCTIONAL BLOCK DIAGRAM CHARGE CONVERSION AMPLIFIER 128 CHANNELS DIFFERENTIAL OUTPUT IINNTT LPF GAIN AMPLIFIER MULTIPLEXER 128:1 TIMING SIGNALS 128 TIMING AND CONTROL 7 CONTROL REGISTER MUX SELECTOR 2427 OUTPUT BUFFER OUTHI OUTLO Figure 1. CONTROL SIGNALS Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. 1 page AD8488 Data Sheet Parameter OUTPUT VOLTAGE OUTHIGH OUTLOW INPUT REFERRED NOISE4 Normal Low Power PANEL CAPACITANCE LINEARITY ERROR5 Normal Low Power OPERATING TEMPERATURE Test Conditions/Comments CF1 = 0.9 pF, G = 10 CPANEL = 38 pF CPANEL = 61 pF CF1 = 0.9 pF, G = 5 Ambient, normal and low power Min Typ Max Unit 2.0 V 2.0 V 993 2000 0 e−rms e−rms 80 pF 0.03 + 1 % + LSB 0.2 + 8.2 % + LSB 0 85 °C 1 Defined as the output voltage divided by the input charge (number of electrons in this case) with the gain amp setting (G = 1). This includes the gain error of the gain amp. 2 Each gain at G = 2, G = 4, G = 8, and G = 10 is calculated as the ratio of each output voltage to that at G = 1. Each measurement corresponds to the selection of each gain setting capacitor. 3 Gain deviation over temperature. 4 The output noise voltage is measured and converted into the input referred noise electrons. 5 It is defined as the deviation from a best fit line, including the origin. The output voltage is measured with five different input conditions. Rev. A \| Page 4 of 20 5 Page AD8488 Table 7. 255-Ball CSP_BGA Ball Assignment (Alphabetically by Signal) Signal Ball Signal Ball Signal Ball Signal AGND E5 AVDD H12 HOLD T16 IN43 AGND E6 AVDD J6 IN0 N11 IN44 AGND E7 AVDD J11 IN1 P11 IN45 AGND E8 AVDD K6 IN2 T11 IN46 AGND E9 AVDD K11 IN3 T12 IN47 AGND F5 AVDD L6 IN4 T10 IN48 AGND G5 AVDD L8 IN5 R11 IN49 AGND G7 AVDD L9 IN6 R12 IN50 AGND G8 AVDD L10 IN7 P12 IN51 AGND G9 AVDD L11 IN8 T4 IN52 AGND G10 CLK D15 IN9 N12 IN53 AGND H5 CK_ENa E14 IN10 T9 IN54 AGND H7 CK_ENb F14 IN11 R10 IN55 AGND H8 CS_A N14 IN12 P10 IN56 AGND H9 CS_B M15 IN13 T8 IN57 AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AGND AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD AVDD H10 J5 J7 J8 J9 J10 K5 K7 K8 K9 K10 L5 L7 M5 M6 M7 M8 M9 M10 M11 F6 F7 F8 F9 F10 G6 G11 H6 H11 CF1SEL0 CF1SEL1 DGND DGND DGND DGND DGND DGND DGND DGND DGND DGND DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD DVDD FSEL0 FSEL1 GRST GNSEL0 GNSEL1 GNSEL2 GNSEL3 C15 B15 F16 G15 G16 H15 H16 J15 J16 K15 K16 L16 B16 C16 D16 E16 F15 L15 M16 N16 P16 R16 R14 T14 H14 D14 C14 B14 A14 IN14 P9 IN15 R9 IN16 T5 IN17 T3 IN18 T2 IN19 T1 IN20 T6 IN21 T7 IN22 R8 IN23 R7 IN24 P8 IN25 R1 IN26 R2 IN27 R3 IN28 R4 IN29 R5 IN30 R6 IN31 P1 IN32 N8 IN33 N10 IN34 P7 IN35 P6 IN36 P5 IN37 P3 IN38 P4 IN39 P2 IN40 N9 IN41 N1 IN42 N6 IN58 IN59 IN60 IN61 IN62 IN63 IN64 IN65 IN66 IN67 IN68 IN69 IN70 IN71 IN72 IN73 IN74 IN75 IN76 IN77 IN78 IN79 IN80 IN81 IN82 IN83 IN84 IN85 IN86 Ball N5 N4 N3 N2 M1 M4 M3 M2 N7 L4 L3 L2 L1 K4 K3 K2 K1 J4 J3 J2 J1 H4 H3 H2 H1 E3 E2 G4 G3 G2 G1 C8 E1 F4 F3 F2 F1 A5 C7 E4 D8 A6 D7 D6 Data Sheet Signal IN87 IN88 IN89 IN90 IN91 IN92 IN93 IN94 IN95 IN96 IN97 IN98 IN99 IN100 IN101 IN102 IN103 IN104 IN105 IN106 IN107 IN108 IN109 IN110 IN111 IN112 IN113 IN114 IN115 IN116 IN117 IN118 IN119 IN120 IN121 IN122 IN123 IN124 IN125 IN126 IN127 IRST NC NC Ball D5 D4 D3 D2 D1 C6 C5 C4 C3 C2 C1 B6 B5 B4 B3 B2 B1 B8 B7 A4 A3 A2 D10 A7 A8 A9 B9 C9 A10 B10 C10 D9 A11 B11 C11 E11 D11 A12 B12 D12 C12 E15 A13 A15 Signal Ball NC B13 NC C13 NC D13 NC E10 NC E12 NC E13 NC F11 NC F13 NC G13 NC H13 NC J12 NC J13 NC K13 NC L13 NC M12 NC M13 NC N13 NC P13 NC R13 NC T13 OUTLOW F12 OUTHIGH G12 PWR P14 RST A16 TST_MODE J14 TST0 T15 TST1 R15 TST2 P15 TST3 N15 TST4 M14 TST5 L14 TST6 K14 VREF L12 VREF_ESD K12 WR G14 Rev. A \| Page 10 of 20 11 Page

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